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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Overall Statistics for Loan Portfolio (Parenthetical) (Details)	Jun. 30, 2024	Dec. 31, 2023
Receivables [Abstract]
Interest rate used in calculating weighted-average cash coupon for non-accrual or cost recovery loans	0.00%	0.00%

X

- Definition

Financing Receivable, Nonaccrual Or Cost Recovery Loans, Weighted Average Interest Rate

+ References

No definition available.

+ Details

Name:	ari_FinancingReceivableNonaccrualOrCostRecoveryLoansWeightedAverageInterestRate
Namespace Prefix:	ari_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration